Device for wrapping yarn around nelson rollers

ABSTRACT

A device for wrapping yarn around nelson rollers, or a pair of rollers with their axes arranged side by side but spaced apart wider at their free ends than at the supported ends and rotating together. A guide is located above and on a plane extended from a point of the pair of rollers which is a given distance inward from the free ends, and the guide is adapted to revolve around the both rollers thereby to pass the yarn in a desired number of wraps therearound, and, after having wrapped the yarn in this manner, the guide is kept out of direct contact with the running yarn. The wrapping guide is either hinged turnably on a spindle adapted to revolve around the pair of rollers or split into two, a lower half being fixed to the spindle whereas an upper half is detachably secured to the lower one. The spindle is equipped with a weight to allow the wrapping guide to take the same direction during its circular motion around the nelson rollers caused by a rotating member. A stopper is provided which stops the rotating member after the wrapping of the yarn around the rollers.

United States Patent 1 [111 3,912,185

Yamada Oct. 14, 1975 DEVICE FOR WRAPPING YARN AROUND NELSON ROLLERS [75]Inventor: Kiyomi Yamada, Nagoya, Japan [73] Assignee: Mitsubishi JukogyoKabushiki Kaisha, Tokyo, Japan [22] Filed: Jan. 3, 1974 [21] Appl. No.:430,531

[30] Foreign Application Priority Data Jan. 12, 1973 Japan 48-6863 [52]US. Cl. 242/47.03 [51] B6511 51/26 [58] Field of Search 242/47.03,47.01, 47.02, 242/4704, 47.05, 47.06, 47.07, 47.08, 47.09, 47.1, 47.11,47.12, 47.13; 28/595, 61, 62, 71.3, 72.17

[56] References Cited UNITED STATES PATENTS 2,232,500 2/1941 Weaver242/47.03

2,350,182 5/1944 Neff 242/47.03 2,525,760 10/1950 Barker... 242/47.032,545,015 3/1951 Barker 242/47.03 2,794,542 6/1957 Vandenburgh et a1.242/47.03 3,077,313 2/1963 Seney 242/47.09

Primary ExaminerStanley N. Gilreath Attorney, Agent, or Firm-Toren,McGeady and Stanger [57] ABSTRACT A device for wrapping yarn aroundnelson rollers, or a pair of rollers with their axes arranged side byside but spaced apart wider at their free ends than at the supportedends and rotating together. A guide is located above and on a planeextended from a point of the pair of rollers which is a given distanceinward from the free ends, and the guide is adapted to revolve aroundthe both rollers thereby to pass the yarn in a desired number of wrapstherearound, and, after having wrapped the yarn in this manner, theguide is kept out of direct contact with the running yarn. The wrappingguide is either hinged tumably on a spindle adapted to revolve aroundthe pair of rollers or split into two, a lower half being fixed to thespindle whereas an upper half is detachably secured to the lower one.The spindle is equipped with a weight to allow the wrapping guide totake the same direction during its circular motion around the nelsonrollers caused by a rotating member. A stopper is provided which stopsthe rotating member after the wrapping of the yarn around the rollers.

6 Claims, 5 Drawing Figures US. Patent Oct. 14, 1975 Sheet 1 of 23,912,185

FIG.2 FIG,3

PRIOR ART PRIOF? ART U.S. Patent 00. 14, 1975 Sheet 2 of2 3,912,185

FIG. z.

FIG. 5

DEVICE FOR WRAPPING YARN AROUND NELSON ROLLERS SUMMARY OF THE INVENTIONThis invention relates to a device for wrapping yarn around nelsonrollers on textile machines.

Conventional nelson rollers in use with textile machinery comprise pairsof rollers l, 2 as shown in FIG. 2 whose axes are arranged side by sidebut spaced apart narrower at their free ends than at the supported ends.Yarn has usually been wrapped around each pair of such rollers in eitherof two ways. One method is by the use of an air sucker which is providedon the exit side of a yarn feeder and carries and wraps the yarn aroundthe rollers by dint of vacuum. The other method consists of drawing offthe yarn from the exit by a combination of a ring and a traveller as ona ring twisting frame and then wrapping the yarn around the rollers byhand with the aid of a guide in the form of a snail wire. The former isimpractical where the yarn leaving the nelson rollers is to becontinuously fed via a nozzle or the like to the subsequent process, forexample for crimping with hot compressed fluid. The air sucker in thiscase will not work unless the nozzle is split and made openable in thedirection where the yarn runs. The latter has a disadvantage, too, inthat, if the tension of the yarn at the exit is below a certain level,as shown in FIG. 3, the tension will be further decreased by thefriction between a guide 3 and the yarn in the section 4 between theguide and the nelson rollers. Consequently, the mirror adhesion of theroller surfaces will overcome the tension and cause the yarn to stickaround the rollers, making the wrapping impossible. Another alternativeis to arrange the pair of rollers with their axes spaced apart wider atthe free ends than at the supported ends, hold a snail wire or suchlikeguide through which yarn passes toward the yarn-receiving portions ofthe nelson rollers, and wrap the yarn around the both rollers. Actuallythe procedure is too cumbersome for general acceptance.

The present invention is proposed with the view to eliminating theforegoing disadvantages of the prior art arrangements. The invention hasfor its object to provide a device for wrapping yarn around nelsonrollers which ensures smooth wrapping of yarn even with a low tension atthe yarn-releasing ends of the nelson rollers and avoids any frictionalcontact during normal operation between the wrapping guide and the yarnbeing received by the nelson rollers.

BRIEF DESCRIPTION OF THE DRAWING The invention is illustrated, by way ofexample, by the accompanying drawings, in which:

FIG. 1 is a schematic front sectional view of a device embodying theinvention for wrapping yarn around nelson rollers;

FIG. 2 is a front view of a pair of conventional nelson rollers;

FIG. 3 is a side view of another pair of conventional nelson rollers;

FIG. 4 is a schematic front sectional view of another embodiment of theinvention; and

FIG. 5 is a sectional view taken on the line X-X of FIG. 4.

DETAILED DESCRIPTION OF THE INVENTION Referring to FIG. 1, a tubularyarn-wrapping guide 5 is shown as secured to a spindle 7 by a hinge 6 sothat it can turn on end to the position 5' indicated by broken lines.The end of the guide 5 at which the yarn leaves is positioned above andon a plane extended from a point of a pair of nelson rollers 8, 9 whichis a given distance inward from the free ends of the rollers. The end ofthe guide 5 where the yarn enters is so disposed that the section b ofthe yarn from a point A does not touch any part of the pair of nelsonrollers 8, 9 as the yarn is wrapped therearound. The point A representsthe position from which the yarn is introduced into the wrapping device.The wrapping guide 5 drawn in full lines is in the course of wrappingthe yarn around the both rollers. The guide assumes the broken-lineposition 5 when it has wound the yarn in a desired number of wrapsaround the both rollers and has resumed its position for normaloperation. At that time the guide stands parallel to the yarn a, thesurrounding wall of the guide hole being out of contact with the yarn.Whether in upright posture or not, the guide is so built as to remainrigidly in its selected position. As noted above, the bore of the guide5 is large enough to permit the yarn a during normal operation to runclear of the surrounding wall, although the exact dimension depends uponthe handling and space requirements to be satisfied and the size of yarnto be encountered.

An arm 10 carries at one end the spindle 7 rotatably with a bearing 11.The arm 10 is bent to an L-shape and a rotating member 12 is rigidlyfixed to the other end.

. This end portion of the arm 10 is rotatably supported by a stationarymember 14 via a bearing. To the extremity of the end portion of thespindle so supported is fixed a weight 13, which keeps the wrappingguide 5 in the same direction and posture during the circular motion ofthe spindle 7 caused by the rotation of the arm 10 with the rotatingmember 12. A stopper 15 is provided which stops the rotating member 12after the yarn has been passed a desired number of wraps around thenelson rollers and also brings the weight 13 into engagement with thestationary member 14 thereby to keep the guide 5 in the position 5parallel to the run ning yarn a. The pair of nelson rollers 8, 9 arearranged with a space therebetween gradually increased from thesupported ends toward the free ends. As shown, the point A is locatedabove and on a plane extended from a point of the pair of the nelsonrollers which is a given distance inward from the free ends of therollers and also a given distance away from the entrance of the wrappingguide 5.

The operation of the device according to the invention will now beexplained. First, the yarn c passes through the wrapping guide 5 in theposition 5" indicated by chain lines in FIG. 1, and runs toward a nextstation (not shown) where it is imparted with a proper tension for thesubsequent handling. In this state the yarn is not wrapped yet aroundthe nelson rollers 8, 9. Next, the rotating member 12 is driven in thedirection of an arrow D, and the guide 5 revolves around the nelsonrollers which are running contrariwise in the directions of arrows B.Consequently, the yarn from the guide 5 is wrapped around the rollers.The portions of the rollers to which the yarn is directed and wrappedacross the axes of the rollers depend upon the relative inclinations ofthe roller axes and upon the position of the guide 5 above theyarn-receiving end portions of the rollers. The relative inclinations ofthe roller axes being the same, the yarn position will be dictated bythe position of the axial exit end portion of the guide. Each revolutionof the wrapping guide 5 around the nelson rollers 8, 9 forms a completewrap of the yarn therearound, the yarn being gradually urged toward theyarn-releasing end portions of the rollers. In this way the yarn can bepassed in a desired number of wraps around the rollers by impartingrotation to the rotating member 12. After the yarn has been wrappedaround the rollers as desired, the guide is turned on end to theposition 5 and is kept from further revolution by the stopper 15. Theyarn-wrapping operation is thus concluded.

FIG. 4 illustrates another embodiment of the invention which employs awrapping guide 16 unlike the counterpart 5 of FIG. 1. As shown insection in FIG. 5, the guide 16 is split into an upper half 16 and alower half 16", the latter being fixedly mounted on the spindle 7. Theupper half 16 is detachably secured to the lower half 16".

The embodiment of FIG. 4 operates in the following way. In the samemanner as described in connection with FIG. 1, the yarn in the path 0(not shown in FIG. 4) passes through the wrapping guide 16 to theensuing station where it is subjected to certain tension. In this state,therefore, the yarn is yet to be wrapped around the nelson rollers.Next, the rotating member 12 (not shown here) is driven in the directionof the arrow D in FIG. 1. This causes the wrapping guide 16 to revolvewith the arm around the nelson rollers, thereby wrapping the yarn fromthe guide 16 around the both rollers. After the yarn has been passed adesired number of wraps around the rollers, the upper half 16 of theguide 16 is detached, so that the yarn from the point A runs directlyalong a path a toward the rollers clear of the wrapping device. Thus,with this embodiment the yarn is totally free from the wrappingarrangement and this eliminates the necessity of providing a wrappingdevice for each pair of nelson rollers as in the past. On the machineswhich use a number of nelson rollers only a single wrapping device cando the job as it is sequentially associated with the pairs of therollers one after another.

As has been described above, the device of the invention performswrapping of yarn around the yarnreceiving portions of nelson rollerssatisfactorily without the use of an air sucker even when the yarnleaving the rollers runs through a nozzle or the like toward asubsequent process. Moreover, because the yarn that has passed in adesired number of wraps around the nelson rollers can run out of contactwith the wrapping guide, the yarn during normal operation following thewrapping around the rollers is freed from any frictional contact withthe guide, and smooth running of the yarn is ensured. Since it can cutoff the contact between the yarn and the wrapping guide, the deviceaccording to the invention can be used even in the case where the yarnis being pretreated before arrival at the nelson rollers and thepretreated yarn should not come into contact with anything on its way tothe latter. With these features the device of the invention may be usedon all the textile machines, such as bulking machines, that employnelson rollers.

I claim:

1. A device for wrapping yarn around nelson rollers, or a pair ofrollers with their axes arranged side by side but spaced apart wider attheir free ends than at the supporting ends and rotating together,comprising a wrapping guide having an end from which the yarn leaves formovement toward said pair of rollers, said end of said guide is locatedabove and on a plane extending through a point on the pair of rollerswhich is a given distance inward from the free ends thereof, said guidebeing rotatable about said rollers to wrap the yarn thereabout, the yarnbeing delivered from a position above said rollers and guide to saidrollers near said point and after being wrapped extending from saidsupported ends, means for rotating said guide about said rollersincluding a rotatable arm, a spindle rotatably attached at one end ofsaid arm, and a means for rotatably driving said arm attached at theother end, a weight mounted on said spindle near the end supported bysaid arm, and said guide mounted at the other end of said spindle.

2. A device for wrapping yarn around nelson rollers according to claim 1wherein said wrapping guide is hinged turnably on said spindle torevolve around the pair of rollers.

3. A device for wrapping yarn around nelson rollers according to claim1, wherein said wrapping guide comprises two halves, a lower half fixedto said spindle adapted to revolve around the pair of rollers and anupper half detachably secured to said lower half.

4. A device for wrapping yarn around nelson rollers according to claim1, including a stopper for engaging and preventing rotation of saidrotating means after the wrapping of the yarn around the pair ofrollers.

' 5. A device for wrapping yarn around nelson rollers according to claim2, wherein said guide comprises an opening therethrough to guide theyarn when it is being wrapped about the nelson rollers and which allowsthe yarn to pass therethrough when the yarn has been wrapped withoutcontacting the guide.

6. A device according to claim 3, wherein the upper half of said guideis removed from the lower half after the yarn has been wrapped about thenelson rollers so that the yarn will not contact said guide.

1. A device for wrapping yarn around nelson rollers, or a pair ofrollers with their axes arranged side by side but spaced apart wider attheir free ends than at the sUpporting ends and rotating together,comprising a wrapping guide having an end from which the yarn leaves formovement toward said pair of rollers, said end of said guide is locatedabove and on a plane extending through a point on the pair of rollerswhich is a given distance inward from the free ends thereof, said guidebeing rotatable about said rollers to wrap the yarn thereabout, the yarnbeing delivered from a position above said rollers and guide to saidrollers near said point and after being wrapped extending from saidsupported ends, means for rotating said guide about said rollersincluding a rotatable arm, a spindle rotatably attached at one end ofsaid arm, and a means for rotatably driving said arm attached at theother end, a weight mounted on said spindle near the end supported bysaid arm, and said guide mounted at the other end of said spindle.
 2. Adevice for wrapping yarn around nelson rollers according to claim 1wherein said wrapping guide is hinged turnably on said spindle torevolve around the pair of rollers.
 3. A device for wrapping yarn aroundnelson rollers according to claim 1, wherein said wrapping guidecomprises two halves, a lower half fixed to said spindle adapted torevolve around the pair of rollers and an upper half detachably securedto said lower half.
 4. A device for wrapping yarn around nelson rollersaccording to claim 1, including a stopper for engaging and preventingrotation of said rotating means after the wrapping of the yarn aroundthe pair of rollers.
 5. A device for wrapping yarn around nelson rollersaccording to claim 2, wherein said guide comprises an openingtherethrough to guide the yarn when it is being wrapped about the nelsonrollers and which allows the yarn to pass therethrough when the yarn hasbeen wrapped without contacting the guide.
 6. A device according toclaim 3, wherein the upper half of said guide is removed from the lowerhalf after the yarn has been wrapped about the nelson rollers so thatthe yarn will not contact said guide.